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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc961a19328c13ba1d7fdca163598cd7f8fa8c287cf288417f2f75775ca8ed3' 
  AND token = 'HJnPcPYlmYNijQ/4h7lAL7So3pqB7xTU2qUSeQ8XAyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}